Five women have been killed in a shooting at a Christian church in Russia's volatile republic of Dagestan.
Five others, including a police officer and a national guardsman, were injured, Russian officials said.
A man in the city of Kizlyar fired at people leaving an evening service on Sunday.
The attacker was shot and killed at the scene. He was later identified as 22-year-old Khalil Khalilov, a resident of Dagestan. The Islamic State (IS) group said it was behind the attack.
The gunman used a hunting rifle, opening fire on worshippers leaving a service during celebrations for Maslenitsa - a traditional pre-Lent festival, Russian media report.
Four women were killed at the scene, and another woman died later in a hospital.
Russian news outlet RBK Daily quoted an Orthodox priest as saying the attack took place immediately following the afternoon service.
"We had finished the mass and were beginning to leave the church. A bearded man ran towards the church shouting 'Allahu Akbar' (God is greatest) and killed four people," the priest said.
"He was carrying a rifle and a knife," he added.
IS later said - through its information wing Amaq - that one of its "soldiers" had carried out the attack.
However, it provided no evidence to back up its claims.
IS made the claim in the name of its so-called "Caucasus Province", the last official branch set up by the group in 2015.
The branch has claimed a number of deadly attacks against security personnel in Dagestan.
Dagestan, located in Russia's North Caucasus, is an ethnically diverse and largely Muslim federal republic.